Table 3
Initial fractional fractional abundances (
), effective radii (re) and expansion velocities (Vexp) derived from radiative transfer modelling.
| Molecule |  index |
re (cm) | Vexp km s−1 |
|---|---|---|---|
| T Dra (C-rich with X-rays) | |||
| HCO+ (2024) | 3.0×10−8 | 3.0×1016 | 10.0 |
| HCO+ (2020) | 1.5×10−8 | 3.0×1016 | 10.0 |
| HCN | 8.0×10−5 | 6.0×1015 | 12.0 |
| HC3N | 1.2×10−5 | 1.7×1015 | 10.0 |
| SiO | 2.5×10−6 | 1.8×1015 | 10.0 |
| SiC2(*) | 1.3×10−6 | 3.0×1016 | 10.0 |
| C2H(*) | 5.0×10−7 | 1.0×1017 | 10.0 |
| SiS (*) | 2.0×10−7 | 5.0×1015 | 8.0 |
| HNC | 1.8×10−7 | 5.0×1015 | 9.0 |
| N2H+ (*) | <3.0× 10−8 | 1.0×1016 | 10.0 |
| EY Hya (O-rich with X-rays) | |||
| HCO+ (*) | <1.0×10−7 | 1.0×1016 | 6.0 |
| SiO | 2.0×10−7 | 1.0×1016 | 6.0 |
| VY Uma (C-rich without X-rays) | |||
| HCO+ (*) | <5.0×10−8 | 1.0×1016 | 5.5 |
| HCN | 1.5×10−6 | 8.0×1014 | 5.5 |
| V Eri (O-rich without X-rays) | |||
| HCO+ (*) | <3.0×10−8 | 1.0×1016 | 6.0 |
| SiO | 2.0×10−7 | 7.0×1015 | 6.0 |
Notes. Column (1): molecule, Col. (2): initial abundance relative to H2, Col (3): effective radius, Col (4): expansion velocity. (*) Indicates that re and Vexp were assumed (see Sect. 5.3).
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